Even if not actually used, ensure all symbols are available when linking
tests to handle cases where unused symbols were not optimized out.
https://bugs.gentoo.org/894702
--- a/SConstruct
+++ b/SConstruct
@@ -172,4 +172,2 @@
 	CPPPATH=(env.get('CPPPATH', []) + [pathjoin('tests', 'unit', 'include')]),
-	# Do not link against the actual implementations of SDL, OpenGL, etc.
-	LIBS=sys_libs,
 	# Pass the necessary link flags for a console program.